Unwanted alert window: Unexpected use of reserved word 'let' in strict mode

[Commifreak]

Describe the bug
One region, one HTML View: The linux player embedded HTML viewer has problems with Javascript's let keyword.

To Reproduce
Embed HTML page with let Javascript? I included Check_MK dashboard to let this happen.

Expected behavior
No JS error

Logs
not applicable

Screenshots

Environment (please complete the following information):

• Linux Disto: Ubuntu 20.04
• Linux Desktop Environment: GNOME
• How the player was launched: snap
• Player Version: 1.8-R6

[dasgarner]

The Linux player browser engine does not support ES6 syntax which is why you're getting this error (that same page would not work in many older Android devices, IE or Safari 8, either).

The only recourse in this case is to update the source web page for ES5.

We should not show the alert dialog though! So I will re-purpose this bug report for that.

[Commifreak]

Maybe it would be better to upgrade the browser engine to support ES6?

[dasgarner]

We have an open PR for this, which outlines the problems we're facing doing that: #179

Currently we're faced with building WebKitGTK entirely from source, which really isn't optimal.

If you would like to take a look at it and update the PR then that would be much appreciated.

[Commifreak]

Thats something I can't help with. I can program in PHP - thats all :)